>> virginia had been the capital of confederacy. >> confederacy history month in virginia. wasn't slaver worth a mention? >> slavery was the controlling and central issue and i don't know anyone with historical creance -- credence would differ with that? >> the united states has used nuclear-weapons only twice, against her were she not and nagasaki toward the end of world war ii. afterwards japan surrendered. once we have the bomb the soviets wanted one and the nuclear arms race was on. president obama announced he is reworking america's nuclear strategy, scaling back the role of nuclear weapons in the nation's defense and putting limits on when they can be used. in prague the president and his russian counterpart signed an agreement to cut their nuclear weapons by one-third over the next seven years. president obama is pledging not to go nuclear against countries will abide by the nuclear non- proliferation treaty if it -- even if they attack the u.s. with chemical or biological weapons. the president's critics say he is weakening our defense posture per posture. you agree